Bent Wood Chair Arms: Steam-Bent OEM Parts
Bent arm components in ash, beech and laminated plywood, pressed or steam-bent to your radius specification and machined to ±0.5mm. Typical MOQ is set per drawing, with tooling developed in 7–15 days.
We manufacture bent wood chair arms to customer drawings — steam-bent or laminated arms for dining, lounge and contract seating, including replacement runs matched to existing profiles.
Chair arms we manufacture
- Continuous arm bows — single-piece curved arms with no corner joints.
- Shaped arms with supports — arms with integrated verticals and stretchers.
- Replacement arms — matched to originals for restoration and reupholstery programmes.
Specifications
| Construction | Solid steam-bent or laminated (bent plywood) |
| Materials | White ash, beech, birch, black walnut, mixed hardwoods |
| Dimensions | Custom to drawings; CNC accuracy within ±0.5 mm |
| Finishes | Raw, sanded, oiled, stained or lacquered |
| Lead time | Prototype 7–15 days · bulk 15–30 days |
Why bending matters for arms
An arm that is jointed at the corners concentrates stress exactly where the hand rests and where the chair rocks back. A steam-bent arm carries the grain around the curve, so the part flexes with the frame instead of failing at the glue line — the reason bent arms remain standard on contract seating that must survive decades of daily use.
Why arms fail — and why bending fixes it
The arm is the most abused part of a chair. Guests push down on it to stand — a momentary force well beyond the static weight of a sitter — and on armchairs with exposed wood arms, that load arrives at exactly the point where a jointed construction is weakest: the corner. An arm assembled from straight pieces carries that load through a glue line and a fastener; a continuous bent arm carries it through unbroken grain.
The published test loads show what the market expects. Under ANSI/BIFMA X5.1, armrests are tested to 667 N vertical and 445 N horizontal; X5.4 for lounge seating specifies 45 kg on each arm. European EN 16139 cycles seating through 100,000 seat-load repetitions with arms loaded. A jointed arm can pass a static test and still fail in service, because the failure mode is fatigue at the joint rather than a single overload — which is precisely what continuous-grain bending avoids.
Construction choices
- Continuous arm bow — a single bent piece from back post to front, no corner joints. Strongest and cleanest visually; needs a generous radius relative to the section.
- Bent arm with integrated supports — the arm is bent to shape and the verticals are joined to it; the bend still removes the corner stress at the critical point.
- Laminated arms — where the design needs a tighter curve or a compound shape than solid wood allows, lamination reaches it with 1–3% springback instead of 3–8%.
Fitting arms to your frame
Arms are only as good as their interfaces. We machine to your drawing: drilled and countersunk fixing points, flats for the support joints, and the seat clearance your upholstery schedule needs. Dimensions are held to ±0.5 mm by CNC machining after bending, so arms arrive ready for your assembly line rather than needing hand fitting. Send the frame drawing and the arm detail together — reviewing them as one assembly is how interface problems get caught before tooling.
Replacement arms
Exposed wood arms on classic and contract seating are a frequent replacement item. Send the original arm or a sample and we will match profile, section, radius and finish. The mould is built to the original curve and kept on file, so re-orders years later produce the same part.
Species for arms
The species decision for an arm balances the load it carries against the radius the design needs:
- Ash — the default for load-bearing arms: elastic, shock-resistant, and able to take a tight radius in a slender section. Pale and stain-friendly.
- Beech — slightly harder and denser; suits painted finishes and traditional café-style arms.
- Walnut — for premium programmes where the dark figure is the point; better suited to generous radii, or used as a face over a laminated core where the curve is tight.
- Laminated construction — reaches compound curves and keeps springback to 1–3%, useful where the arm wraps the back post.
Specification summary
| Construction | Solid steam-bent or laminated (bent plywood) |
| Materials | White ash, beech, birch, black walnut, mixed hardwoods |
| Dimensions | Custom to drawings; CNC accuracy within ±0.5 mm |
| Machining | Fixing points, support joints and seat clearance to your spec |
| Finishes | Raw, sanded, oiled, stained or lacquered |
| Lead time | Prototype 7–15 days · bulk 15–30 days |
| Certification | FSC/PEFC materials available |
Ordering
Send the arm detail and the frame drawing together, with the test standard the finished seating must meet. We confirm section, species and radius, quote within 24 hours, and deliver prototypes in 7–15 days. Replacement arms are quoted from the original part — send a sample and we will match it.
Common arm profiles
| Profile | Description | Typical use |
| Continuous bow | Single bent piece, back post to front, no corner joints | Windsor-style, classic and contract armchairs |
| Shaped arm with verticals | Bent arm with joined supports | Dining armchairs; transitional designs |
| Wrap-around arm | Arm curves around the back post | Lounge seating; laminated construction |
| Flat-profile arm | Wide, flat bent section | Contemporary and minimalist seating |
| Replacement arm | Matched to an original part | Restoration and contract refresh |
Working with us
Send the arm detail with the frame drawing and the test standard the seating must meet. We confirm section, species and radius — flagging any curve that needs lamination — quote within 24 hours, and deliver prototypes in 7–15 days. If the arm design will not bend reliably, you will hear that at quotation stage, not after a broken sample.
Summary
Bent arms solve the failure mode that defines wooden armchairs: load arriving at a corner joint. Continuous grain around the curve carries the stand-up force that guests apply every day, and the test standards the market uses — 667 N vertical and 445 N horizontal under ANSI/BIFMA X5.1 — are written around exactly that load. Send the arm detail with the frame drawing, and we will confirm section, species and radius before quoting.
Frequently asked questions
Can you match existing chair arms for replacement production?
Yes — send the original arms or a sample and we will replicate the profile, radius and finish. This is a common request for contract seating and classic chair programmes.
What construction do you recommend for arms?
Solid steam-bent arms keep the grain continuous and are strongest where the arm carries load; laminated arms allow tighter curves. We will recommend based on your design and volume.
What tolerances can you hold?
CNC machining delivers dimensional accuracy within ±0.5 mm, so arms fit your frames without rework.
Do you supply arms in small quantities?
Yes — low MOQ is supported, with prototypes in 7–15 days and production runs in 15–30 days.
Ready to start your project? Send your drawings, samples or specifications to our team and receive a quotation within 24 hours. Request a quote or learn more about our factory.